As bad as my eating habits are, I'd be like 400 lbs if I didn't put in 25 miles a day on my commute. And stressed out, too.
I do have to say that a few months ago when gas was $4 and the weather was still nice, it sure seemed that there was a disproportionate adoption of alternative transport by nubile representatives of the fairer sex. That was a brief bonus inspiration for the commute. Not that I would ever leer (excessively) or behave in an untoward manner, but oh I thought some ungentlemanly thoughts.
Now that gas is closing back on $2 and it is getting cold and wet, I'm back to just my own fatness and stress.